Downed ball carrier. On the youth level, a ball carrier is considered down if he accidentally touches the ground with his knee by slipping or falling without being touched by a defensive player.

No re-entry to the field. Unless he is blocked or pushed out of bounds by the defensive team, an offensive player who goes out of bounds cannot step back onto the field and rejoin the action.

Seven players on the line of scrimmage. In addition to the five offensive linemen, an offensive team must have at least two tight ends or split ends at the line of scrimmage.

Live ball on kickoffs. After the football travels 10 yards on a kickoff, either team is allowed to secure and advance it.

Untimed down. If the defense commits a penalty on the last play of a quarter, the offense is given another down without any time on the clock. There is not an untimed down if only the offense commits a penalty on the final play of a quarter.

Running or roughing the punter/kicker. Most people know roughing the kicker brings about a 15-yard penalty and an automatic first down for the kicking team. But there is another similar rule with a much different penalty. If the defensive player runs into the kicker, it draws a 5-yard penalty and no automatic first down. Incidental contact is not a penalty.

Ineligible receiver downfield. Your team’s offensive linemen need to know this rule. An offensive player who is not an eligible player cannot go more than five yards downfield from the line of scrimmage during a pass.

Backward pass. A backward pass is the same as a lateral, so it’s considered a fumble if not caught by an offensive player. Either team can recover the football.

Pass interference. This penalty can be signaled against either the offense or defense. It occurs when a player interferes with an opposing’s ability to catch a pass. Pass interference may include tripping, pushing, pulling or cutting in front of the opposing player.

Clipping or blocking in the back. These dangerous penalties often occur on kicks and punts. Clipping is contact against an opponent from behind and below the waist, while blocking in the back occurs from behind and above the waist. The exception to these rule is against the ball carrier.